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Oxygen uptake efficiency slope and peak oxygen consumption predict prognosis in children with tetralogy of Fallot

Yun-Jeng Tsai1, Min-Hui Li1, Wan-Jung Tsai2

  • 1Department of Physical Medicine and Rehabilitation, Kaohsiung Veterans General Hospital, Kaohsiung, Taiwan.

European Journal of Preventive Cardiology
|December 25, 2015
PubMed

Insights

Oxygen uptake efficiency slope (OUES) and peak oxygen consumption (VO2peak) can predict hospitalizations in children after tetralogy of Fallot repair. These exercise parameters offer valuable prognostic insights for pediatric cardiac patients.

Area of Science:

  • Pediatric Cardiology
  • Cardiopulmonary Exercise Testing
  • Congenital Heart Disease

Background:

  • Oxygen uptake efficiency slope (OUES) and peak oxygen consumption (VO2peak) are established cardiac morbidity predictors in various heart conditions.
  • Their prognostic value in children with tetralogy of Fallot (ToF) post-total repair remains under-evaluated.

Purpose of the Study:

  • To assess the predictive capability of OUES and VO2peak for cardiac-related hospitalizations in children following surgical repair of ToF.

Main Methods:

  • A retrospective cohort study involving 40 children under 12 years old who underwent ToF repair.
  • Cardiopulmonary exercise testing (CPET) was performed during follow-up.
  • CPET results were analyzed to predict cardiac-related hospitalizations within two years post-test.

Main Results:

  • Both OUES normalized by body surface area (OUES/BSA) and percentage of predicted VO2peak were found to be predictive of two-year cardiac-related hospitalizations.
  • Receiver operating characteristic (ROC) curve analysis identified optimal thresholds: OUES/BSA of 1.029 (AUC=0.70, p=0.03) and VO2peak of 74% predicted (AUC=0.72, p=0.02).
  • Kaplan-Meier plots and log-rank tests confirmed these predictive findings.

Conclusions:

  • OUES/BSA and VO2peak serve as valuable predictors of cardiac-related hospitalizations in pediatric patients after total repair of tetralogy of Fallot.
  • These non-invasive exercise parameters can aid in risk stratification and management of ToF survivors.
Abstract

Keywords:
Oxygen uptake efficiency slopecardiopulmonary exercise testchildrenprognosistetralogy of Fallot

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